parse_event.c

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/*
 * $Id$
 *
 * Event header field body parser.
 *
 * Copyright (C) 2001-2003 FhG Fokus
 *
 * This file is part of ser, a free SIP server.
 *
 * ser is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version
 *
 * ser is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License 
 * along with this program; if not, write to the Free Software 
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * History:
 * --------
 * 2003-04-26 ZSW (jiri)
 */

#include "parse_event.h"
#include "../mem/mem.h"    /* pkg_malloc, pkg_free */
#include "../dprint.h"
#include <string.h>        /* memset */
#include "../trim.h"       /* trim_leading */
#include <stdio.h>         /* printf */
#include "../ut.h"

static struct {
        str name;
        int type;       
} events[] = {
        {STR_STATIC_INIT("presence"),        EVENT_PRESENCE},
        {STR_STATIC_INIT("presence.winfo"),  EVENT_PRESENCE_WINFO},
        {STR_STATIC_INIT("xcap-change"),     EVENT_XCAP_CHANGE},
        {STR_STATIC_INIT("sip-profile"),     EVENT_SIP_PROFILE},
        {STR_STATIC_INIT("message-summary"), EVENT_MESSAGE_SUMMARY},
        {STR_STATIC_INIT("dialog"),          EVENT_DIALOG},
        {STR_STATIC_INIT("ua-profile"),      EVENT_UA_PROFILE},
        /* The following must be the last element in the array */
        {STR_NULL,                           EVENT_OTHER}
};


static inline char* skip_token(char* _b, int _l)
{
        int i = 0;

        for(i = 0; i < _l; i++) {
                switch(_b[i]) {
                case ' ':
                case '\r':
                case '\n':
                case '\t':
                case ';':
                        return _b + i;
                }
        }

        return _b + _l;
}


int event_parser(char* s, int len, event_t* e)
{
        int i;
        str tmp;
        char* end;
        param_hooks_t* phooks = NULL;
        enum pclass pclass = CLASS_ANY;

        if (e == NULL) {
                ERR("event_parser: Invalid parameter value\n");
                return -1;
        }

        tmp.s = s;
        tmp.len = len;
        trim_leading(&tmp);

        if (tmp.len == 0) {
                LOG(L_ERR, "event_parser: Empty body\n");
                return -1;
        }

        e->name.s = tmp.s;
        end = skip_token(tmp.s, tmp.len);
        e->name.len = end - tmp.s;

        e->type = EVENT_OTHER;
        for(i = 0; events[i].name.len; i++) {
                if (e->name.len == events[i].name.len &&
                        !strncasecmp(e->name.s, events[i].name.s, e->name.len)) {
                        e->type = events[i].type;
                        break;
                }
        }

        tmp.len -= end - tmp.s;
        tmp.s = end;
        trim_leading(&tmp);

        e->params.list = NULL;
        
        if (tmp.len && (tmp.s[0] == ';')) {
                /* Shift the semicolon and skip any leading whitespace, this is needed
                 * for parse_params to work correctly. */
                tmp.s++; tmp.len--;
                trim_leading(&tmp);
                if (!tmp.len) return 0;

                /* We have parameters to parse */
                if (e->type == EVENT_DIALOG) {
                        pclass = CLASS_EVENT_DIALOG;
                        phooks = (param_hooks_t*)&e->params.hooks;
                }

                if (parse_params(&tmp, pclass, phooks, &e->params.list) < 0) {
                        ERR("event_parser: Error while parsing parameters parameters\n");
                        return -1;
                }
        }
        return 0;
}


int parse_event(struct hdr_field* _h)
{
        event_t* e;

        if (_h->parsed != 0) {
                return 0;
        }

        e = (event_t*)pkg_malloc(sizeof(event_t));
        if (e == 0) {
                LOG(L_ERR, "parse_event(): No memory left\n");
                return -1;
        }

        memset(e, 0, sizeof(event_t));

        if (event_parser(_h->body.s, _h->body.len, e) < 0) {
                LOG(L_ERR, "parse_event(): Error in event_parser\n");
                pkg_free(e);
                return -2;
        }

        _h->parsed = (void*)e;
        return 0;
}


void free_event(event_t** _e)
{
        if (*_e) {
                if ((*_e)->params.list) free_params((*_e)->params.list);
                pkg_free(*_e);
                *_e = NULL;
        }
}


void print_event(event_t* e)
{
        fprintf(stderr, "===Event===\n");
        fprintf(stderr, "name  : \'%.*s\'\n", STR_FMT(&e->name));
        fprintf(stderr, "type: %d\n", e->type);
        if (e->params.list) {
                print_params(stderr, e->params.list);
        }
        fprintf(stderr, "===/Event===\n");
}